Chirality in Molecules The cis isomer is achiral. The trans isomer is chiral. Enantiomers:nonsuperimposable mirror images, different molecules. same compound different compounds CI H CI H cis-1,2-dichlorocyclopentane trans-1,2-dichlorocyclopentane (achiral) (chiral) Copyright 2010 Pearson Prentice Hall,Inc. Chirality in Molecules The cis isomer is achiral. The trans isomer is chiral. Enantiomers: nonsuperimposable mirror images, different molecules